Adronic hand-held light source provides superior illumination with a strong yellow LED light. It features in special mechanism design. The unique design enables to retain the heat internally and would not transmit to the surface to avoid high temperature, this makes the diagnosed process more comfortable within long time usage. The power is supplied by a rechargeable Li-ion battery, it could be operated continually for 50 to 85 minutes depends on battery condition. Also with the light and portable design, it facilitates to use or carry out.